Ashton also used the opportunity to chat up his former stepdaughter, Rumer Willis, 23. The two were all laughs and smiles as they talked for about 20 minutes before Willis, 23, went back to hanging out with her mom, spywitnesses say.

The chance sighting of Demi and Ashton was the first public one since the actress moved to end their marriage in November, amid a string of cheating allegations. Just before Thanksgiving, Moore abruptly announced plans to formally end her marriage to the Two and a Half Men actor, following tabloid reports that Kutcher repeatedly cheated on her.

The small screen side-splitter was even accused of bedding a twenty-something on the eve of their sixth wedding anniversary in September.

"It is with great sadness and a heavy heart that I have decided to end my six-year marriage to Ashton. As a woman, a mother and a wife there are certain values and vows that I hold sacred, and it is in this spirit that I have chosen to move forward with my life," Moore said in a statement.

Old pal Madonna has reportedly been Demi's rock through the devastating marital collapse.

"She is calling Demi almost every day and sends her messages telling her to be proud of her strength and to know that she fought to make her marriage work," Hello! magazine dished shortly after the high-profile split.

"Madonna has had many younger boyfriends so she understands their mindset. She has told Demi that Ashton's immaturity is evident and that she deserves someone who will fulfill her intellectually and emotionally."